Sulphide Capacity of CaO–SiO2–Al2O3–MgO System Relevant to Low MgO Blast Furnace Slags

Desulphurization has been of more importance to control the quality of hot metal in blast furnace (BF) with increasing utilization of low-grade iron ores and poor-quality fuels as well as reducing the slag volume by decreasing MgO concentration. To improve performance with better understanding the desulphurization in BFs, sulphide capacities of CaO-SiO -Al O -MgO system relevant to BF slags were experimentally determined using gas-slag equilibration technique. The results show that sulphide capacity increases with the increase in temperature, CaO/SiO weight ratio and MgO at fixed Al O concentration. The experimental results were further compared with sulphide capacity obtained from available models in open literature. In addition, the equilibrium sulphur partition ratio between slag and hot metal was calculated from sulphide capacity with oxygen activity in the melt, which is also compared with industrial data and the laboratory experiments of kinetic desulphurization of hot metal.

[1]  Dianwei Zhang,et al.  Phase Equilibria Studies in the CaO–SiO2–Al2O3–MgO System with CaO/SiO2 Ratio of 1.10 , 2016 .

[2]  Xinhua Wang,et al.  A New Sulfide Capacity Model for CaO‐Al2O3‐SiO2‐MgO Slags Based on Corrected Optical Basicity , 2016 .

[3]  A. Nguyen,et al.  Viscosity Model for Iron Blast Furnace Slags in SiO2–Al2O3–CaO–MgO System , 2015 .

[4]  P. Mahapatra,et al.  Optimisation of MgO addition in low and high silica iron ore sinter to improve sinter reducibility at JSW Steel Limited , 2014 .

[5]  K. Chou,et al.  Estimation of Sulfide Capacities of Multicomponent Slags using Optical Basicity , 2013 .

[6]  日野 光兀,et al.  Thermodynamic data for steelmaking , 2010 .

[7]  S. Seetharaman,et al.  Sulphide Capacities of CaO–Al2O3–SiO2–MgO–MnO Slags in the Temperature Range 1673–1773K , 2009 .

[8]  A. Lahiri,et al.  Sulfide capacity of high alumina blast furnace slags , 2006 .

[9]  Amitabh Shankar,et al.  Sulphur partition between hot metal and high alumina blast furnace slag , 2006 .

[10]  Xinying Lu,et al.  An experimental study on the properties of resistance to diffusion of chloride ions of fly ash and blast furnace slag concrete , 2000 .

[11]  S. Seetharaman,et al.  Sulphide capacities in some multi component slag systems , 1998 .

[12]  I. Sommerville,et al.  The composition and temperature dependence of the sulfide capacity of metallurgical slags , 1986 .

[13]  S. C. Panigrahy,et al.  Influence of MgO addition on mineralogy of iron ore sinter , 1984 .

[14]  G. A. Irons,et al.  Bubble formation at nozzles in pig iron , 1978 .